US20120050089A1 - Radar activation multiple access system and method - Google Patents
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- US20120050089A1 US20120050089A1 US12/873,032 US87303210A US2012050089A1 US 20120050089 A1 US20120050089 A1 US 20120050089A1 US 87303210 A US87303210 A US 87303210A US 2012050089 A1 US2012050089 A1 US 2012050089A1
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- 230000004913 activation Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000004891 communication Methods 0.000 claims abstract description 10
- 230000006870 function Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/003—Transmission of data between radar, sonar or lidar systems and remote stations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/003—Bistatic radar systems; Multistatic radar systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/87—Combinations of radar systems, e.g. primary radar and secondary radar
Definitions
- the present invention generally relates to radar activation. More specifically, the present invention relates to radar activation multiple access for a plurality of nodes.
- Multistatic radar and a subset, Multiple Input Multiple Output (MIMO) radar are becoming increasingly popular radar systems.
- the MIMO or multistatic radar uses multiple radar apertures, functioning as either a transmitter or a receiver at a given time period.
- the apertures are widely dispersed or closely spaced within a vicinity. Because of the number and location of transmitters and/or receivers, the problem of sharing a limited space and channel access arises.
- MIMO or multistatic radar systems are equipped with a scheduling methodology to determine which of the multiple independent radar apertures function as a transmitter or receiver and for how long.
- the scheduling of the transmitters and receivers takes place via a sequential handshaking with problems of latency and loss.
- fairness and quality of signals there is the issue of fairness and quality of signals. That is, due to shortcomings in the algorithm for selection, role designation and scheduling of the various apertures, the algorithm favors apertures over others and thus, fails to beneficially utilize all of the apertures.
- MIMO or multistatic radar systems are not utilized until such a session is requested.
- the initiation, coordination and setup of transmitters and receivers cause a detectable traffic exchange between apertures. That is, the amount of traffic changes and even spikes upwards just before a radar mission, thereby disadvantageously signaling the radar mission.
- a radar activation multiple access system comprises a plurality of radar participant nodes wirelessly connected and forming a radar network and a multiple access unit in communication with the radar network.
- the multiple access unit includes a scheduler component, a synch component, a priority component and a radar activation component.
- the scheduler component is configured to schedule a period of operation having a plurality of time divisions within the period of operation.
- the synch component is configured to synchronize the radar participant nodes within the period of operation.
- the priority component is configured to assign a priority to individual radar participant nodes in the radar network.
- the radar activation component is communicatively connected to the radar network and configured to determine a contentious state at a time division in the period of operation. The radar activation component instructs individual nodes to assume the role of transmitter or receiver based on the assigned priority.
- a radar activation multiple access method basically comprises defining a radar network with a plurality of radar participant nodes wirelessly connected; scheduling at least one period of operation having a plurality of time divisions within the period of operation; synchronizing the radar participant nodes within the period of operation; assigning a priority to individual radar participant nodes in the radar network; determining a contentious state at a time division in the period of operation; determining the radar participant node with the highest assigned priority; and instructing the radar participant node with the highest priority to assume the role of transmitter and instructing the remaining radar participant nodes to assume the role of a receiver.
- FIG. 1 is a schematic of a radar activation multiple access system showing examples of participants having radar nodes in a radar network for transmitting and receiving according to an embodiment of the present invention
- FIG. 2 is a schematic of a multiple access unit of the radar activation multiple access system according to an embodiment of the present invention
- FIG. 3 is a schematic of a synchronized period or operation in accordance with an embodiment of the present invention.
- FIG. 4 is a schematic of a multiple access unit of the radar activation multiple access system according another embodiment of the present invention.
- the system 1 includes a plurality of radar participant nodes 2 in a wireless communication network 4 and a multiple access unit 6 .
- the radar participant node 2 can exist alone or can be an integral part of a participant, wherein the participant is a vehicle, aircraft, missile or person, for example.
- the radar participant nodes 2 are communicatively connected in the wireless communication network 4 and are able to determine their neighbors in a neighborhood forming the wireless communication network 4 by exchanging the necessary information with each other as is well known in the art.
- the radar participant nodes 2 are in a 2-hop topology.
- the plurality of radar participant nodes 2 have omnidirectional radar transceivers and constitute a radar network 8 with a shared area of coverage 10 .
- the multiple access unit 6 can be integrated into a central radar participant node 2 or the components of the multiple access unit 6 can be separated into radar participant nodes 2 throughout the network 4 .
- the multiple access unit 6 does not have to be a physically separate unit from the radar participant node(s) 2 and can be embodied in various ways, as will become apparent to one of ordinary skill in the art from this disclosure.
- the present invention develops and implements an activation schedule for a plurality of nodes 2 accessing a common channel within the wireless network 4 .
- the activation schedule indicates whether a particular node 2 within the plurality of radar participant nodes 2 in the radar network 8 with a shared area 10 of coverage should function as a transmitter or as a receiver to avoid simultaneous transmissions.
- the multiple access unit 6 includes a synchronization component 12 and a scheduler component 14 .
- the synchronization component 12 is configured to synchronize the radar participant nodes 2 and time divisions 16 , 18 , 20 over a period of operation 22 .
- the synch component 14 accomplishes synchronization by utilizing a GPS clock signal, for example.
- the scheduler component 14 is a data scheduler configured to schedule the periods of operation 22 and other uses of the time divisions 20 .
- the scheduler component 14 can schedule the periods of operation 22 pseudo randomly or periodically.
- the scheduler component 14 is further configured to schedule when the synchronization component 12 needs to perform future synchronizations. Referring to FIG.
- a period of operation 22 can be represented as a set of time divisions 16 , 18 .
- time divisions 16 , 18 utilized by the multiple access unit 6 are indicated with a “+” and every third slot, indicated with “ ⁇ ”, is a time division 20 allocated to another schedule not serviced by the present invention.
- the time divisions 16 , 18 , 20 can vary in length of time or can be equal units of time. It will be apparent to one of ordinary skill in the art from this disclosure that the multiple access unit 6 can utilize all of the time divisions 16 , 18 , 20 in a period of operation 22 or utilize time divisions 16 , 18 , 20 in patterns other than that shown in FIG. 3 .
- the synch component 12 and the scheduler component 14 are operatively connected to share data needed for operation.
- the scheduler component 14 can notify the synch component 12 of the periods of operation 22 mapped out in time by the scheduler component 14 and divide the periods into time divisions 16 , 18 , 20 for use by the radar participant nodes 2 .
- the synch component 12 can then synchronize a plurality of the radar participant nodes 2 so that they are all apprised of the time divisions 16 , 18 , 20 and the opportunities to transmit. Utilizing the present invention, all participants will know their roles at every time division until the next synchronization period.
- the nodes 2 share a common channel and therefore must take turns transmitting in the radar network 8 .
- the synch component 12 and the scheduler 14 have configured a period of operation 22 for the nodes 2 to transmit between every third time division 20 .
- a contentious state occurs.
- the present invention advantageously solves the contentious state by avoiding simultaneous transmissions that could cause collisions.
- the present invention is also advantageous because it provides an unbiased sharing of network bandwidth and facilitates constant bandwidth utilization.
- the multiple access unit 6 further includes a priority component 24 and a radar activation component 26 in communication with the priority component 24 .
- the priority component 24 establishes the level of priority that each of the nodes 2 have in the radar network 8 for a given time division 16 , 18 .
- the priority component 24 includes a pseudo random number generator and assigns a pseudo random, unique priority number to each node 2 in the radar network 8 .
- the radar activation component 26 is communicatively connected to the radar participant nodes 2 and is configured to implement the priorities created by the priority component. That is, in the event of a contentious state between two or more nodes 2 , the radar activation component 26 signals the node 2 with the highest priority number to transmit and signals the remaining nodes 2 to yield and receive radar transmissions. That is, by virtue of the highest unique priority number, which was pseudo randomly assigned, the “winning” node 2 assumes the role of a transmitter and all other nodes 2 in the radar network 8 , including the node 2 that “lost” in the contentious state, assume the role of a receiver for that time division.
- the radar activation component 26 is further configured to handle necessary communications with the radar network 8 and preferably includes one or more transceivers to communicate with one or more nodes 2 .
- the radar activation component 26 is configured to use the transceiver to instruct the nodes 2 to assume the role of transmitter or receiver, as well as use in other communications.
- the node 2 that lost would then transmit in the immediately subsequent time division 18 , assuming that another node 2 does not intend to transmit. Should there be two or more nodes 2 intending to transmit in the immediately subsequent time division 18 , the radar activation component 26 will instruct the node 2 with the highest priority number to transmit. This limits bias toward any one node 2 and therefore avoids under utilization of nodes 2 since the priority numbers are pseudo randomly assigned.
- the individual nodes 2 possess a unique participant identification number to identify the individual nodes 2 and assign the unique priority numbers.
- the unique participant identification number can be assigned by the priority component 24 or the radar activation component 26 , for example.
- the nodes 2 have a unique pre-assigned identification number that is obtained by the radar activation component 26 .
- the node 2 has a transponder function and transmits its participant's identity through secondary surveillance radar to the radar activation component 26 , for example.
- the multiple access unit 6 includes a selection component 28 that is in communication with the priority component 24 .
- the nodes 2 may possess optimal attributes that were unknown to the priority component 24 at the time of priority number assignment.
- the selection component 28 utilizes pre-defined criteria to reassign or modify priority numbers according to the known optimal attributes.
- the selection component 28 may include a selection algorithm that is configured for determining the priority of nodes 2 with one or more desired optimal attributes.
- the selection component 28 may also possess an interface for modification of the algorithm to adapt to changing circumstances in the coverage area 10 .
- the optimal attribute can be a beneficial position of the node 2 in the coverage area 10 , battery life of the node 2 , power source of the node 2 , or operability, for example.
- the selection component 28 is configured to collaborate with the priority component 24 and modify the assigned priority numbers up or down based on the optimal attributes. For example, if the selection component 28 detects that a node 2 with a low priority number is located at a beneficial position, the selection component 28 will instruct the priority component 24 to raise the priority number.
- the present invention eliminates the need to schedule the mission ahead of time. For complex cases where there may be more than two participant nodes 2 contending for the same time slot/division, the scheduling duration is much shorter. Furthermore, the information for implementing the system 1 and method is distributed in a continuous manner, thereby shortening the timeline required to determine which node 2 transmits and which nodes 2 receive. The system 1 and method is continually updating necessary information and is able to provide the determination of the transmittal role and the receiver role without having to wait for responses from remote platforms because the information is already available within the multiple access unit 6 .
- the system 1 and method is also able to provide a current known state for all participants.
- detectable traffic exchange between participants does not vary, providing the appearance of a featureless data exchange that is more difficult to detect because the amount of traffic does not change, e.g., does not spike upwards just before a radar mission.
- the multiple access unit 6 preferably includes a microcomputer with a control program that controls the components 12 , 14 , 24 , 26 , 28 discussed above.
- the multiple access unit 6 can also include other conventional components such as an input interface circuit, an output interface circuit, and a memory circuit having storage devices such as a ROM (Read Only Memory) device and a RAM (Random Access Memory) device.
- the memory circuit stores processing results and control programs such as ones for operation of the components.
- the multiple access unit 6 is capable of selectively controlling any of the components of the multiple access unit 6 in accordance with the control program. It will be apparent to those skilled in the art from this disclosure that the precise structure and algorithms for the multiple access unit 6 can be any combination of hardware and software that will carry out the functions of the present invention.
- Features of the present invention as described herein should include any structure or hardware and/or algorithm or software that can be utilized to carry out the function of the features.
- the term “configured” as used herein to describe a component, unit or part of a device includes hardware and/or software that is constructed and/or programmed to carry out the desired function.
- the term “comprising” and its derivatives, as used herein, are intended to be open ended terms that specify the presence of the stated features, elements, components, parts of a device, and/or steps, but do not exclude the presence of other unstated features, elements, components, parts of a device and/or steps.
- the foregoing also applies to words having similar meanings such as the terms, “including”, “having” and their derivatives.
- the terms “component,” “unit,” or “device” when used in the singular can have the dual meaning of a single part or a plurality of parts.
- terms of degree such as “substantially”, “about” and “approximately” as used herein mean a reasonable amount of deviation of the modified term such that the end result is not significantly changed. For example, these terms can be construed as including a deviation of at least ⁇ 5% of the modified term if this deviation would not negate the meaning of the word it modifies.
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Abstract
Description
- 1. Field of the Invention
- The present invention generally relates to radar activation. More specifically, the present invention relates to radar activation multiple access for a plurality of nodes.
- 2. Background Information
- Multistatic radar and a subset, Multiple Input Multiple Output (MIMO) radar, are becoming increasingly popular radar systems. The MIMO or multistatic radar uses multiple radar apertures, functioning as either a transmitter or a receiver at a given time period. In any given system, there can be a single transmitter with multiple receivers, a single receiver with multiple transmitters or multiple transmitters and multiple receivers. The apertures are widely dispersed or closely spaced within a vicinity. Because of the number and location of transmitters and/or receivers, the problem of sharing a limited space and channel access arises.
- MIMO or multistatic radar systems are equipped with a scheduling methodology to determine which of the multiple independent radar apertures function as a transmitter or receiver and for how long. Typically, the scheduling of the transmitters and receivers takes place via a sequential handshaking with problems of latency and loss. Furthermore, there is the issue of fairness and quality of signals. That is, due to shortcomings in the algorithm for selection, role designation and scheduling of the various apertures, the algorithm favors apertures over others and thus, fails to beneficially utilize all of the apertures.
- In addition, in some radar systems, MIMO or multistatic radar systems are not utilized until such a session is requested. The initiation, coordination and setup of transmitters and receivers cause a detectable traffic exchange between apertures. That is, the amount of traffic changes and even spikes upwards just before a radar mission, thereby disadvantageously signaling the radar mission.
- In view of the above, it will be apparent to those skilled in the art from this disclosure that there exists a need for an improved system and method that provides radar activation multiple access. This invention addresses this need in the art as well as other needs, which will become apparent to those skilled in the art from this disclosure.
- The present invention facilitates use of a common channel in a radar network. A radar activation multiple access system is provided that comprises a plurality of radar participant nodes wirelessly connected and forming a radar network and a multiple access unit in communication with the radar network. The multiple access unit includes a scheduler component, a synch component, a priority component and a radar activation component. The scheduler component is configured to schedule a period of operation having a plurality of time divisions within the period of operation. The synch component is configured to synchronize the radar participant nodes within the period of operation. The priority component is configured to assign a priority to individual radar participant nodes in the radar network. The radar activation component is communicatively connected to the radar network and configured to determine a contentious state at a time division in the period of operation. The radar activation component instructs individual nodes to assume the role of transmitter or receiver based on the assigned priority.
- A radar activation multiple access method is provided that basically comprises defining a radar network with a plurality of radar participant nodes wirelessly connected; scheduling at least one period of operation having a plurality of time divisions within the period of operation; synchronizing the radar participant nodes within the period of operation; assigning a priority to individual radar participant nodes in the radar network; determining a contentious state at a time division in the period of operation; determining the radar participant node with the highest assigned priority; and instructing the radar participant node with the highest priority to assume the role of transmitter and instructing the remaining radar participant nodes to assume the role of a receiver.
- These and other objects, features, aspects and advantages of the present invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses preferred embodiments of the present invention.
- Referring now to the attached drawings which form a part of this original disclosure:
-
FIG. 1 is a schematic of a radar activation multiple access system showing examples of participants having radar nodes in a radar network for transmitting and receiving according to an embodiment of the present invention; -
FIG. 2 is a schematic of a multiple access unit of the radar activation multiple access system according to an embodiment of the present invention; -
FIG. 3 is a schematic of a synchronized period or operation in accordance with an embodiment of the present invention; and -
FIG. 4 is a schematic of a multiple access unit of the radar activation multiple access system according another embodiment of the present invention. - Referring initially to
FIG. 1 , a radar activation multiple access system is illustrated in accordance with a first embodiment of the present invention and is designated generally as 1. Thesystem 1 includes a plurality ofradar participant nodes 2 in awireless communication network 4 and amultiple access unit 6. Theradar participant node 2 can exist alone or can be an integral part of a participant, wherein the participant is a vehicle, aircraft, missile or person, for example. Theradar participant nodes 2 are communicatively connected in thewireless communication network 4 and are able to determine their neighbors in a neighborhood forming thewireless communication network 4 by exchanging the necessary information with each other as is well known in the art. Preferably, theradar participant nodes 2 are in a 2-hop topology. As theradar participant nodes 2 are radar nodes, the plurality ofradar participant nodes 2 have omnidirectional radar transceivers and constitute a radar network 8 with a shared area ofcoverage 10. - It will be apparent to one of ordinary skill in the art from this disclosure that, while the
multiple access unit 6 is shown separate from thewireless network 4, themultiple access unit 6 can be integrated into a centralradar participant node 2 or the components of themultiple access unit 6 can be separated intoradar participant nodes 2 throughout thenetwork 4. In other words, themultiple access unit 6 does not have to be a physically separate unit from the radar participant node(s) 2 and can be embodied in various ways, as will become apparent to one of ordinary skill in the art from this disclosure. - The present invention develops and implements an activation schedule for a plurality of
nodes 2 accessing a common channel within thewireless network 4. The activation schedule indicates whether aparticular node 2 within the plurality ofradar participant nodes 2 in the radar network 8 with a sharedarea 10 of coverage should function as a transmitter or as a receiver to avoid simultaneous transmissions. - To develop and implement the active schedule, the
multiple access unit 6 includes asynchronization component 12 and ascheduler component 14. Thesynchronization component 12 is configured to synchronize theradar participant nodes 2 andtime divisions operation 22. Thesynch component 14 accomplishes synchronization by utilizing a GPS clock signal, for example. Thescheduler component 14 is a data scheduler configured to schedule the periods ofoperation 22 and other uses of thetime divisions 20. Thescheduler component 14 can schedule the periods ofoperation 22 pseudo randomly or periodically. Thescheduler component 14 is further configured to schedule when thesynchronization component 12 needs to perform future synchronizations. Referring toFIG. 3 , a period ofoperation 22 can be represented as a set oftime divisions operation 22,time divisions multiple access unit 6 are indicated with a “+” and every third slot, indicated with “−”, is atime division 20 allocated to another schedule not serviced by the present invention. Thetime divisions multiple access unit 6 can utilize all of thetime divisions operation 22 or utilizetime divisions FIG. 3 . - The
synch component 12 and thescheduler component 14 are operatively connected to share data needed for operation. For example, thescheduler component 14 can notify thesynch component 12 of the periods ofoperation 22 mapped out in time by thescheduler component 14 and divide the periods intotime divisions radar participant nodes 2. Thesynch component 12 can then synchronize a plurality of theradar participant nodes 2 so that they are all apprised of thetime divisions - During operation of the radar network 8, the
nodes 2 share a common channel and therefore must take turns transmitting in the radar network 8. In the embodiment shown, thesynch component 12 and thescheduler 14 have configured a period ofoperation 22 for thenodes 2 to transmit between everythird time division 20. However, if more than onenode 2 signals to themultiple access unit 6 that they intend to transmit in thesame time division 16, a contentious state occurs. The present invention advantageously solves the contentious state by avoiding simultaneous transmissions that could cause collisions. The present invention is also advantageous because it provides an unbiased sharing of network bandwidth and facilitates constant bandwidth utilization. - The
multiple access unit 6 further includes apriority component 24 and aradar activation component 26 in communication with thepriority component 24. Thepriority component 24 establishes the level of priority that each of thenodes 2 have in the radar network 8 for a giventime division FIG. 2 , thepriority component 24 includes a pseudo random number generator and assigns a pseudo random, unique priority number to eachnode 2 in the radar network 8. - The
radar activation component 26 is communicatively connected to theradar participant nodes 2 and is configured to implement the priorities created by the priority component. That is, in the event of a contentious state between two ormore nodes 2, theradar activation component 26 signals thenode 2 with the highest priority number to transmit and signals the remainingnodes 2 to yield and receive radar transmissions. That is, by virtue of the highest unique priority number, which was pseudo randomly assigned, the “winning”node 2 assumes the role of a transmitter and allother nodes 2 in the radar network 8, including thenode 2 that “lost” in the contentious state, assume the role of a receiver for that time division. Theradar activation component 26 is further configured to handle necessary communications with the radar network 8 and preferably includes one or more transceivers to communicate with one ormore nodes 2. Theradar activation component 26 is configured to use the transceiver to instruct thenodes 2 to assume the role of transmitter or receiver, as well as use in other communications. Thenode 2 that lost would then transmit in the immediatelysubsequent time division 18, assuming that anothernode 2 does not intend to transmit. Should there be two ormore nodes 2 intending to transmit in the immediatelysubsequent time division 18, theradar activation component 26 will instruct thenode 2 with the highest priority number to transmit. This limits bias toward any onenode 2 and therefore avoids under utilization ofnodes 2 since the priority numbers are pseudo randomly assigned. - The
individual nodes 2 possess a unique participant identification number to identify theindividual nodes 2 and assign the unique priority numbers. The unique participant identification number can be assigned by thepriority component 24 or theradar activation component 26, for example. Alternatively, thenodes 2 have a unique pre-assigned identification number that is obtained by theradar activation component 26. For example, thenode 2 has a transponder function and transmits its participant's identity through secondary surveillance radar to theradar activation component 26, for example. - Referring to
FIG. 4 , in another embodiment of the present invention, themultiple access unit 6 includes aselection component 28 that is in communication with thepriority component 24. In some circumstances, thenodes 2 may possess optimal attributes that were unknown to thepriority component 24 at the time of priority number assignment. Theselection component 28 utilizes pre-defined criteria to reassign or modify priority numbers according to the known optimal attributes. For example, theselection component 28 may include a selection algorithm that is configured for determining the priority ofnodes 2 with one or more desired optimal attributes. Theselection component 28 may also possess an interface for modification of the algorithm to adapt to changing circumstances in thecoverage area 10. The optimal attribute can be a beneficial position of thenode 2 in thecoverage area 10, battery life of thenode 2, power source of thenode 2, or operability, for example. Theselection component 28 is configured to collaborate with thepriority component 24 and modify the assigned priority numbers up or down based on the optimal attributes. For example, if theselection component 28 detects that anode 2 with a low priority number is located at a beneficial position, theselection component 28 will instruct thepriority component 24 to raise the priority number. - The present invention eliminates the need to schedule the mission ahead of time. For complex cases where there may be more than two
participant nodes 2 contending for the same time slot/division, the scheduling duration is much shorter. Furthermore, the information for implementing thesystem 1 and method is distributed in a continuous manner, thereby shortening the timeline required to determine whichnode 2 transmits and whichnodes 2 receive. Thesystem 1 and method is continually updating necessary information and is able to provide the determination of the transmittal role and the receiver role without having to wait for responses from remote platforms because the information is already available within themultiple access unit 6. - The
system 1 and method is also able to provide a current known state for all participants. By continuously distributing state information, detectable traffic exchange between participants does not vary, providing the appearance of a featureless data exchange that is more difficult to detect because the amount of traffic does not change, e.g., does not spike upwards just before a radar mission. - The
multiple access unit 6 preferably includes a microcomputer with a control program that controls thecomponents multiple access unit 6 can also include other conventional components such as an input interface circuit, an output interface circuit, and a memory circuit having storage devices such as a ROM (Read Only Memory) device and a RAM (Random Access Memory) device. The memory circuit stores processing results and control programs such as ones for operation of the components. Themultiple access unit 6 is capable of selectively controlling any of the components of themultiple access unit 6 in accordance with the control program. It will be apparent to those skilled in the art from this disclosure that the precise structure and algorithms for themultiple access unit 6 can be any combination of hardware and software that will carry out the functions of the present invention. Features of the present invention as described herein should include any structure or hardware and/or algorithm or software that can be utilized to carry out the function of the features. - In understanding the scope of the present invention, the term “configured” as used herein to describe a component, unit or part of a device includes hardware and/or software that is constructed and/or programmed to carry out the desired function. In addition, the term “comprising” and its derivatives, as used herein, are intended to be open ended terms that specify the presence of the stated features, elements, components, parts of a device, and/or steps, but do not exclude the presence of other unstated features, elements, components, parts of a device and/or steps. The foregoing also applies to words having similar meanings such as the terms, “including”, “having” and their derivatives. Also, the terms “component,” “unit,” or “device” when used in the singular can have the dual meaning of a single part or a plurality of parts. Finally, terms of degree such as “substantially”, “about” and “approximately” as used herein mean a reasonable amount of deviation of the modified term such that the end result is not significantly changed. For example, these terms can be construed as including a deviation of at least ±5% of the modified term if this deviation would not negate the meaning of the word it modifies.
- While only selected embodiments have been chosen to illustrate the present invention, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made herein without departing from the scope of the invention as defined in the appended claims. Furthermore, the foregoing descriptions of the embodiments according to the present invention are provided for illustration only, and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.
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US20120032833A1 (en) * | 2010-08-09 | 2012-02-09 | Milligan Stephen D | Radar coherent processing interval scheduling via ad hoc network |
US8595037B1 (en) | 2012-05-08 | 2013-11-26 | Elwha Llc | Systems and methods for insurance based on monitored characteristics of an autonomous drive mode selection system |
WO2014011552A1 (en) * | 2012-07-09 | 2014-01-16 | Elwha Llc | Systems and methods for coordinating sensor operation for collision detection |
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